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7L12 (view source)

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{{Plugin Sidebar 2 |
{{Plugin Sidebar  
title=Tektronix 7L12 |
|manufacturer=Tektronix
summary=1.8 GHz Spectrum Analyzer |
|series=7000-series scopes
image=Tek-7l12-led-front.jpg |
|type=7L12  
caption=Tektronix 7L12 (later model) |
|summary=1.8 GHz Spectrum Analyzer
introduced=1971 |
|image=Tek-7l12-led-front.jpg
discontinued=1988 |
|caption=Tektronix 7L12 (later model)
series=[[7000-series scopes]] |
|introduced=1971
manuals=
|discontinued=1988
* [http://w140.com/mmm/tek-7l12.pdf Tektronix 7L12 Manual (PDF)]
|designers=Morris Engelson;Linley Gumm;Gene Kauffman;Larry Lockwood;Gordon Long;Steve Morton;Paul Parks;Fred Telewski;Neal Broadbent;Jack Doyle;Al Huegli;Steve Skidmore;Leighton Whitsett;Judy Hanson; Robert Holmes;Carolyn Moore;Rena Randle
* [http://w140.com/smb/7l12_sm.pdf Tektronix 7L12 Manual (OCR, PDF)]
|manuals=
* [http://w140.com/7l12_foldouts_sm.pdf Tektronix 7L12 Schematics (PDF)]
* [[Media:070-1298-01.pdf|Tektronix 7L12 Instruction Manual -01]] / ''[[Media:070-1298-01.pdf|Alternate copy]] (OCR)''
* [[Media:070-1298-02.pdf|Tektronix 7L12 Instruction Manual -02]]
* [https://w140.com/7l12_foldouts_sm.pdf Tektronix 7L12 Schematics]
* [[Media:Tek 7L12 factory cal december 1972.pdf|Tektronix 7L12 Factory Calibration Procedure]]
* [[Media:Tek 7L12 factory cal december 1972.pdf|Tektronix 7L12 Factory Calibration Procedure]]
* [[Media:26W-4889.pdf|No Loose Ends - Brochure for using the spectrum analyzer for CATV]]
* [[Media:26AX-3582-3.pdf|FM Broadcast Measurements Using the Spectrum Analyzer]]
}}
}}
The '''Tektronix 7L12''' is a 1.8 GHz Spectrum Analyzer plug-in for [[7000-series scopes]].
The '''Tektronix 7L12''' is a 1.8 GHz Spectrum Analyzer plug-in for [[7000-series scopes]].
It is a double-width plugin to be installed in the right vertical and left (or only) horizontal bay.
It is a double-width plugin to be installed in the right vertical and left (or only) horizontal bay.


Early models had a mechanical reference level readout.  Later, front panel outputs  
Early models had a mechanical reference level readout.  Later, front panel outputs for 1st and 2nd LO were added to allow connecting a [[TR501]] or [[TR502]] tracking generator. Late models had LED reference level readout.
for 1st and 2nd LO were added to allow connecting a [[TR501]] or [[TR502]] tracking generator.
Late models had LED reference level readout.


The 7L12 does not have the UNCAL indicator typical for spectrum analyzers that alerts the operator
The 7L12 does not have the UNCAL indicator typical for spectrum analyzers that alerts the operator when the sweep speed is too fast for the given resolution.
when the sweep speed is too fast for the given resolution.
The manual advises to use the variable control to reduce sweep speed until the signal amplitudes don't change.
The manual advises to use the variable control to reduce sweep speed until the signal amplitudes don't change.


The Tek catalogs suggested the [[7603]] Opt.06 or [[7613]] Opt.06 as suitable mainframes.
The Tek catalogs suggested the [[7603]] Opt.06 or [[7613]] Opt.06 as suitable mainframes.
According to [[Media:Tekscope_1972_V4_N1_Jan_1972.pdf|Tekscope Vol.4 No.1 Jan 1972]], the design teams included: ''Electrical Engineering – [[Morris Engelson]], [[Linley Gumm]], [[Gene Kauffman]], [[Larry Lockwood]], [[Gordon Long]], [[Steve Morton]], [[Paul Parks]], [[Fred Telewski]]. Mechanical Engineering – [[Neal Broadbent]], [[Jack Doyle]], [[Al Huegli]], [[Steve Skidmore]], [[Leighton Whitsett]]. Integrated Circuits – [[Judy Hanson]], [[Robert Holmes]], [[Carolyn Moore]], [[Rena Randle]]''.


{{BeginSpecs}}
{{BeginSpecs}}
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{{Spec|Sweep                | 1 μs/Div to 5 ms/Div (1-2-5)}}
{{Spec|Sweep                | 1 μs/Div to 5 ms/Div (1-2-5)}}
{{Spec|Resolution bandwidth | 300 Hz – 3 MHz in decade steps}}
{{Spec|Resolution bandwidth | 300 Hz – 3 MHz in decade steps}}
{{Spec|Sensitivity          | -115 dBm at 300 Hz}}
{{Spec|Sensitivity          | −115 dBm at 300 Hz}}
{{Spec|Vertical scale      | 10 dB/Div, 2 dB/Div or linear}}
{{Spec|Vertical scale      | 10 dB/Div, 2 dB/Div or linear}}
{{Spec|Reference level      | -100 dB<sub>m</sub> – +30 dB<sub>m</sub> }}
{{Spec|Reference level      | −100 dB<sub>m</sub> – +30 dB<sub>m</sub> }}
{{Spec|Video filters        | 30 kHz, 300 Hz or 3 Hz}}
{{Spec|Video filters        | 30 kHz, 300 Hz or 3 Hz}}
{{Spec|Features            |
{{Spec|Features            |
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a 1.8 GHz low-pass filter and a 3 dB pad (to isolate the mixer from LPF reflections) to a 1<sup>st</sup> mixer.
a 1.8 GHz low-pass filter and a 3 dB pad (to isolate the mixer from LPF reflections) to a 1<sup>st</sup> mixer.
The 1<sup>st</sup> LO is a YIG oscillator running at 2.095 GHz to 3.9 GHz, resulting in a 2.095 GHz 1<sup>st</sup> IF.
The 1<sup>st</sup> LO is a YIG oscillator running at 2.095 GHz to 3.9 GHz, resulting in a 2.095 GHz 1<sup>st</sup> IF.
This IF passes through a "traveling wave damper" (isolator),
 
The 1<sup>st</sup> IF passes through a "traveling wave damper" (isolator),
a 2.2 GHz LPF and a 10 MHz wide 2.095 GHz bandpass filter before reaching the 2<sup>nd</sup> mixer.
a 2.2 GHz LPF and a 10 MHz wide 2.095 GHz bandpass filter before reaching the 2<sup>nd</sup> mixer.
The 2<sup>nd</sup> LO oscillates at 2.2 GHz (variable by +/- 1 MHz) for a 2<sup>nd</sup> IF of 105 MHz, which is amplified,
The 2<sup>nd</sup> LO oscillates at 2.2 GHz (variable by ±1 MHz) for a 2<sup>nd</sup> IF of 105 MHz, which is amplified,
then filtered in a 3-stage helical filter with 3 MHz bandwidth before passing through a 3<sup>rd</sup> mixer to the final 10 MHz IF,
then filtered in a 3-stage helical filter with 3 MHz bandwidth before passing through a 3<sup>rd</sup> mixer to the final 10 MHz IF,
variable resolution filters, and post-resolution amplifier to the "Function IF amplifier" that implements the linear or logarithmic detector.   
variable resolution filters, and post-resolution amplifier to the "Function IF amplifier" that implements the linear or logarithmic detector.   
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! Year
! Year
! 1971  
! 1971  
! 1974
! 1976
! 1980   
! 1980   
! 1984  
! 1984  
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! Catalog price
! Catalog price
| align="right" | $4,850  
| align="right" | $4,850  
| align="right" | $4,850
| align="right" | $4,995
| align="right" | $6,500  
| align="right" | $6,500  
| align="right" | $10,250  
| align="right" | $10,250  
| align="right" | $12,500  
| align="right" | $12,500  
|-
|-
! 2015 value
! 2020 Dollars
| align="right" | $28,100
| align="right" | $31,000
| align="right" | $18,760
| align="right" | $25,500
| align="right" | $23,460
| align="right" | $22,700
| align="right" | $24,800
| align="right" | $20,400
| align="right" | $25,500
| align="right" | $27,350
|-
|-
|}
|}
According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], in 1979 annual sales were estimated at 365 units.


==Mods==
==Mods==
* [http://w140.com/Tek7L12-139U.pdf Tektronix 7L12 Mod 139U Increases Bandwidth to 2.5 GHz (PDF)]
* [https://w140.com/Tek7L12-139U.pdf Tektronix 7L12 Mod 139U Increases Bandwidth to 2.5 GHz]


==Links==
==Links==
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* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/spectrumanalyzer_7L12.htm Tek 7L12 @ amplifier.cd]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/spectrumanalyzer_7L12.htm Tek 7L12 @ amplifier.cd]
* [http://www.barrytech.com/tektronix/tek7000/tek7l12.html Tek 7L12 @ barrytech.com]
* [http://www.barrytech.com/tektronix/tek7000/tek7l12.html Tek 7L12 @ barrytech.com]
* 7L12 videos: [https://youtube.com/watch?v=eEsL9443Rt8 #1] / [https://youtube.com/watch?v=a5-IXJEqMbM #2] / [https://youtube.com/watch?v=ctL8NuEvQhk #3] / [https://youtube.com/watch?v=oZA2Fa78_00 #4]
* [https://www.youtube.com/watch?v=f02rCpkjs8Q 7L12 repair] by vintageTek Museum @ YouTube (shows how to pull out the center board)
* 7L12 videos: [https://youtube.com/watch?v=eEsL9443Rt8 #1] / [https://youtube.com/watch?v=a5-IXJEqMbM #2] / [https://youtube.com/watch?v=ctL8NuEvQhk #3] / [https://youtube.com/watch?v=oZA2Fa78_00 #4] [https://youtu.be/f02rCpkjs8Q #5]


==Pictures==
==Pictures==
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Tek 7l12 trace.jpg
Tek 7l12 trace.jpg
</gallery>
</gallery>
{{Custom ICs|7L12}}




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